Can you please explain these expressions to me:
cd - 1>> $LOG // Q - what 1 represent ?
./build_we2s all 1>> $LOG 2>> $LOG // Q - what 2 represent ?
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2 Answers
1 stdout Standard output
2 stderr Standard error
cmd 1>> $LOG append stdout (only) to $LOG
cmd 1>> $LOG 2>>$LOG append stdout and stderr to $LOG
you could do
cmd >> $LOG 2>&1
or
cmd &>>$LOG
too
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1 => stdout. 2 => stderr.
They are the default file descriptors (fd) for stdin & stdout.
